Communication and consistency are key.

@Evelin Negrete - If you don't want to manage tenant communications, hire a virtual assistant for $5-7 dollars an hour and have them take tenant inquires.

Continue to communicate with them what they are buying.  

Typically you do not need to do it as a double closing, you can do it in one closing you just need to communicate with the owner of the property during that time. 

By end of year I am estimated to have saved 45K.I am looking for alternatives to purchase more doors specifically the BRRRR method.  

In my experience, once it gets to the no communication stage it usually never works out

That's a method of borrowing money to borrow money, which is how people over-leverage and get themselves into trouble.You were fortunate enough to jump into the market when everything worked in your favor.

All you need to do is find a lender that understands and specializes in working with BRRRR method investors that flip at scale and at speed.

Utilities, taxes (property, local vacation, & income), landscaping, furnishing / decorations / amenities, pest control, & supplies (soap, TP, etc) are the big ones on my STR calculator that you didn't mention.I'd also recommend using the enemy method to determine expected income.

This method has worked for thousands of years and is still the best option today.A job in Property Management has a low bar of entry.